Loose leaf binder



Feb. 7, 19337 J, c. DAWSON LOOSE' LEAF BINDER Filed Feb. 28, 1931liu/@72h71 5 @.Dwson Patented Feb. 7, 1933 UNITED STATES PATENT OFFICEJAMES C. DAWSON, OF WEBSTER GROVES, MISSOURI, ASSIGNOR TO ELMA N.DAVTSON, OF WEBSTER. GROVES, MISSOURI LOOSE LEAF BINDER Applicationfiled February 28, 1931.

This invention relates to loose leaf binders and has for its objects toprovide simple means for the attachment of booster levers to the coverplates of binders, and to provide booster levers and means for theirattachment to binders of the wire arch frame and spring cover types.

These and other objects of the invention will become apparent from thespecitication and the appended drawing, in which Fig. 1 is a perspectiveView of the binder and portion of the book;

Fig. 2 is a vertical, longitudinal section of the end portion of thebinder, on the line 2-2 of Fig. 1;

Fig. 8 is a bottom plan view of the portion shown in Fig. 2;

Fig. 4 is a section through the binder on the line 4-4 of Fig. 2;

Fig. 5 is a vertical, longitudinal section through a binder of thespring cover type;

Fig. 6 is a vertical section on the line 6-6 of Fig. 5;

Fig. 7 illustrates the booster levers as applied to a binder of the wirearch frame type shown in a bottom plan View; and

Fig. 8 is aA vertical, longitudinal section on the line 8-8 of Fig. 7.

The binder illustrated in Figs. 1, 2, 3 and 4 comprises a spring back11, having hooked margins 12 and 13 in which are retained the toggleplates 14 and 15. The cover plate 16 encloses the mechanism and gives ita finished ap earance. The binder is held to the book bac by means of ametal loop 17 struck up from the metal back plate 18 which passesthrough an aperture 19 in the spring back 11 and is locked in positionby the key 21.

Two transverse ribs 22 may be formed across the cover plate 16 adjacentits ends to increase the stiffness of the cover at this point and theyalso prevent the paper leaves from sticking on the head of the rivet.

As indicated in the figures, the booster lever 23 comprises a thumb arm24, and an operating arm 25 which is downwardly bent so as to giveclearance to the lever when tilted about its pivot. The arm 25 projectsthrough slots 26, 26, cut in the toggle plates 14 and 15 and terminatesin a head 27 which engages Serial N0. 519,137.

the underside of the plates. Between the two ribs 22, a single rivet 28,or its equivalent, holds the booster lever suspended from the coverplate and provides a pivot point around which it may rotate. Pressureupon the thumb arm 24, therefore, lifts the toggle plates and causes theprongs 29 to separate.

The method of attachment of booster levers to binders deriving theirspring action from the cover plate itself is shown in Figs. 5 and 6 andis the same as that previously shown. With springs of this type, thepresence of the transverse ribs 81 is quite desirable since it preventsan undue iattening of the spring cover 32 when the booster lever 38 isdepressed.

But in this particular instance, a dual action is secured and theopening of the prongs is brought about by the application of very littlepressure to the booster levers. When the booster levers are depressed,the pressure transmitted through the rivet 34 causes the spring coverplate 32 to be flattened somewhat and its margins to spread apart. Thisrelieves the pressure upon the toggle plates which are then easilyforced upward by the arm 35.

I prefer to hold this type of binder to the book back by means of a clip36 which engages recesses cut in the toggle plates 37 and 38. The clipis provided with an aperture 39 through which a loop 41 struck up fromthe back plate projects. A key 42 holds the binder assembled to theback.

Due to the fact that the prongs of a wire arch frame binder are formedupon the end of the arch frames, such binders are largely confined touse with the cheaper books where two arches will be satisfactory.Because this bin der holds the paper at only twoy points, the arches arelocated well inside of the top and bottom margins of the sheet.

A bottom plan view of such a binder is illustrated in Fig. 7 where itwill be seen that the binder is composed of two identical wire archframes 44, 44 articulated at 45, 45, and held by the curved margins 46,46 of a channel iframe 47 which forms a cover plate. The booster lever48 may comprise a single bent piece comprising a thumb arm 49 ending ina thumb piece 50, and a booster arm 51 having a lifting portion 52 forengagement with the arch frames 44. The booster lever is supportedagainst the cover plateby the single rivet l53 or its equivalent,while-the binder -itself is held tothe book backbytherivet54 which,passes Ithrough thev clearance hole '5 5 punched through the boosterlever.

I prefer that the thumb arm 50 should project. above the cover platebeyondits .ends

althoughthe thumb arm may :passthrough a slot in the cover plateinstead; The ribs 56-5G 8) are provided as inthe previous forms toprevent the leaves of paper from catching on the headspof'the rivets andalso they `materially stilfen thel cover,

Thearni 49 beingvlonger thanrthearin 51, Y

pressure on the thumb ,pieceA V50- will operate [at mechanical advantage`to inovethe arch l .frames 44 ,from-.closed to Vopen position.`

a rule booster/levers. for wirearchfframe metalslwillfbe much longer.than those ap- -pliedvto other toggle ,metals andgthey may be givenappropriate stiffness `by arching. trans- I Aversely as indicated inFig. 8.

That l claim, therefore, is

1. A loose leafibindeiyliaving a .spring cover platetransverselribs.forstiffening the cover adjacent :its ends, ltoggle elements venclosed bythe cover,aboosterflever engaging the elements and passingbeneatlithenihaving; afthumb arniprojecti-ng beyondtlie cover plate,l and-a rivetpassing kthrough the-cover adjacent the reinforcing ribs, and suspending-tlie booster lever 'from the cover ,plate 2. A wireV arch frame binderhaving a booster 1lever comprisinga ythumb arm eX- 4tendingsul'istant'ially parallel. Vto the :axis

of fthe binder, and .a booster-ann having a 2lifting portion occupyinganfinferior ,plane withgrespect -to ,thethunih arm, and Va j studdepending from the cover and suspendingY the-lever therefrom at the;inner end of the thumb arm. j V3. In a. 1loose transversely with thecrownupward, a toggle. Vvincluding prong-bearing members having avtoggle joint beneath themtei'niediate' por- `tion of the vplate andbearing portionsffconfined betweenfits sides, and-a booster leverfulcruniedonithe crown ofthe arch with one larm operatively .associated`with .the toggle joint to raise the same andopen the prongs. 4. In aloose leaf binder, -a platearched transversely-withthe crown upward, atoggle including prong-bearing members having a toggle joint beneath theintermediate portion 'of vthe plate'and bearing portions confined.between its sides, and a boosterV lever fulcrumed-onsthe crown o-f thearch Vwith one 'd arm operativelyassociated with the toggle ,jointtoraise the sameand. open the prongs, and the otherfarm projecting .fromthei-plate leaf4 binden, afplate arched Y A-gleiincluding'prong-bearingmembers having a toggle joint beneath` the intermediate por-'tioii'o'f-'tlie plate,"a rivet through the plate in the crown ofthearch, a booster lever loosely mounted on the vrivet below and beneaththe,plate..v

in a'fiose .leaf blader, a hanna frame,

.a prong-'bearing wire arch members .monntedinfthe oliannelgframe andliavingcooperating portionsv ,forming a toggle jointl and a boosterlever fulcr'umed'between ythe toggle.. and the .end `of the fiamefandlhaving ,a liftingarm engagingltlietoggle joint.V

8. A 'lose leafbinder having fan arGhlcovergplate, .a pairof4articulated toggleplates bearing transverse slots, a booster ,leverhavl:ingaportion passing through. the slots anda portionextendinggbeneath the plates to ,lift

them and an arm extending .beyond-V the. 95 arched cover toreceivepressure, and,means"" loosely suspending the booster .leverfrointhecover plate.

9. A wire arch framelbinderl havingjprongbearing wirearch.framesfarticulated to :form

frames, anda booster lever pivoted on VIVthe cover and having a portionengagingfand `adapted to lift the arch frames. f

` 10. AA, loose leaf binder havinga coverzplate(v` a rivet headprojecting abovev the normal surface of Vthe-plate', and a ,transverse`rib formed'in the coveradj acent the rib toprevent the paper 'leavesfromcatchingupon-the Vrivetghead.AA 'p d i Y l1.-In a: loose leafbinden .a.boosterlever' vhaving athumb VV arm'and--a booster arm pivoted tothecoverplateofthebinder bve Sillgle element passing lthrough the ,lever A`sub- *stantially atthejunctionofthe two-arms. 12. Ailoose leafbinderhavingprong-bearing'toggles, anarched springv cover receiving thetoggles,",and a booster lever suspended yfromthecenter of the'larcli andarranged to ,engage the togglesto lforce them upwards.y Y, 'andsimultaneously to Hatten .the spring. and therebyrelieve the lpressurelapplied bythe springto,theitogglesV I ,y

lntestimony .whereof I affixmy signature.`

. JAMES c; '.Dliwsoii.

85 spaced 7from rthe Vend. of the lchannel frame,

10o a toggle joint?, ya cover engaging thel .arch""f y Y V.5.Inaloose.lea-fbindenauplate arched I. I

to receive the operating force.

